Rebecca Julia Brown (born August 18, 1992) is an American teen actress and musician from Chicago, Illinois. She began playing guitar at the age of 4. She appeared in the film School of Rock as Katie, the bass player for the band formed in the film. She was chosen for the film after appearing on the From the Top radio show at the age of nine. She is the lead singer and bass guitarist in a Chicago alternative band, Sweet Revenge, formed by her neighbors in 2004.
She had to play bass and cello for School of Rock where she got the nickname 'Reeba Deeba' from castmate Jack Black.